Student creates personal space dress to annoy fellow commuters

Picture it. You're standing on a packed train, sandwiched between a sweaty armpit and a guy's backpack. How satisfying would it be to have some sort of device to push them away and create a non-smelly safety bubble?

What is a personal space dress we hear you say? Simple. It's a dress with two proximity censors and a plastic armature that allow the dress to expand if anyone gets too close. Basically like a big electric umbrella.